Grinding machine



R. F. KNIGHT.

GRINDING MACHINE.

APPLlCATlON FILED lULYI9. 1920.

31 ,4: 1 9%,? 1 u Yatented. June 13, 1922,

//\/ VEN TUA RALPH F. KNIGHT, OF BEVERLY, MASSACHUSETTS, ASSIGNOP. T0 UNITEDYSHOE IHACHINERY CORPORATION, OF PATERSON, ELEV] JERSEY, A CORPORATION 01? NEW JEESEY.

GRINDING MACHINE.

Application filed 5111 1 19,

To all whom it may concern Be it known that l, RALPH F. KNIGHT, a citizen of the United States, and resident of Beverly, in the county of Essex and State of Massachusetts, have invented certain Improvements in Grinding ltclachines, of which the following description, in connection with the accompanyingdrawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to grinding machines of the type adapted more especially for grinding the blades of rotary cutters, as for instance, those of heel trimming machines.

The blades-0f rotary heel trimming and breasting cutters have ordinarily been ground on a machine of the type shown in United States patent to Glidden No. 543,647. Therotary cutter heads are provided with a shaft which is inserted in a relatively fixed bearing on the frame of the machine and the blades have been arranged on the cutter head in planes which diverge with relation to the shaft. It has been found that on heel breasting cutters the blades so arranged, operate with a scraping action which sometimes leaves a ragged edge on the work where the blades leave the heel. It has therefore been proposed to construct the head with the blades at a reversed angle, that is, to arrange them in planes which converge with relation to the cutter shaft in order that the advance or leading face of the blade may meet the face of the heel at an obtuse angle and thus avoid a scraping cut. Hitherto there has been no machine to grind these reversely arranged blades while in the cut ter head.

It is an object of the invention to provide an improved machine which will accurately grind blades to apredetermined shape while in the cutter head. Another object is to provide a machine which will not only grind the blades on reversed cutter heads, but which will also grind the blades of the ordinary cutter heads- In the preferred embodiment the invention is illustrated as an attachment for a Specification of Letters Patent. ym m J ne 13 M922 1920. Serial No. 397,262.

grinding machine of the type shown in the patent referred to. A movable standard, preferably pivoted, is provided with a bearmg for the cutter head shafts, the standard being moved to vary the inclination of the bearing and the shaft, tobring the blades to the proper relation with respect to the grinding wheel. Preferably the contour of the blades will be controlled by a template and former as is usual on machines of the type illustrated in the patent.

Referring to the drawings,-

Fig. l is a top plan view of that portion of the machine to which my invention relates;

Fig. 2 is a side elevation, partly broken away;

Fig. 8 is a front elevation showing one of the cutter heads in its grinding position;

Fig. 4: is a similar View, showing a different cut-ter head in its grinding position.

The numeral 10 indicates the grinding wheel mounted on a horizontal shaft 11. and 12 indicates a former, the contour of which corresponds to the peripheral contour of the grinding wheel 10. A portion of the usual swinging frame which carries my attachment is indicated at 14 and this frame is provided with sockets into which fit pivot posts 16 and 18 which carry respectively the knife carrier 20 and template carrier 22. These two carriers are connected by the usual link 2 so that the carriers may be simultaneously moved to traverse the template 80 across the former 12 and the blade across the grinding wheel. On the template carrier 22 is aslide 26 which may be adjusted by the hand screw 28 and which carries at one end a template 80 for cooperation with the former 12.

Attached to the knife carrier 20 is an apertured bracket 32 having a flange 34rprovided with an enlarged flat bearing face upon which slides a similar bearing face formed on a flange 38 of a standard 36, a felt ring being set into one of the faces if desired, to provide for lubrication. The standard 36 is provided with an offset portion having a hollow trunnion 4O engaging the apertured bracket 32- and being held therein by the washer 42 and screw bolt 44. t should be noted that the axis of this trunnion which intersects the grinding wheel and is at right angles to its shaft passes below he axis of the cutter head and is so disposed that the lower blade in the head will be supported in the proper relation to the grinding wheel and template whether the standard is arranged to support the cutter head shown in Fig. 3 or to support that, shown in Fig. 4t. Mounted in the bracket 32 is a spring-pressed tapered pin 416 manipulated by a handle d8 and this tapered. pin is adapted toengage either of the openings 4-9 or in the standard 36 to lock the latter in the angular position desired. The end of the standard 36 has an inclined bearing 52 to receive the shaft 5d of a cutter head 56 the blades of which are indicated at 58. This cutter head may be of any desired type and can be clamped in the inclined bearing by means of the clamp handle 60. When the head shown in Fig. 3 is to have its blades ground, the spring-pressed pin 46 will be inserted in the aperture 50 of the standard. 36. This will lock the head in the proper position to bring the lowermost blade 58 parallel with the axis of the grinding wheel and parallel with the template. In Fig. l is'indicated the shaft 6d of a cutter head 66 to whose blades 68 are arranged at reversed angles with respect to the shaft 6 1. Whenever these blades are to be ground, the standard 36 will be swung upon its pivot 40 and the pin 4:6 snapped into the other aperture 41-9 of the standard. This locks the standard in a position to bring the lowermost blade 68 into proper relation to the wheel for grinding. Thus, by an easy manipulation of the standard, the machine can be quickly adapted to grind blades on the different cutter heads.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1.. In a machine for grinding rotary cutters whose blades have different cutting angles, a grinding wheel and a bearing member pivotally mounted on an axis intersecting the grinding wheel to present the blades of the different rotary cutters in proper relation to the wheel for grinding.

2. In a machine for grindnig rotary cutters whose blades have different cutting angles, a shaft, a grinding wheel, a standard having a bearing for the cutter shafts, said bearing being inclined to the axis of the grinding wheel, and a pivotal mounting for the standard extending at right angles to the shaft of the grinding wheel so that the inclination of the bearing may be changed.

3. In a. machine for grinding rotary cutters whose blades have reversed cutting angles, a grinding wheel, a standard having a bearing for the cutter shafts, said bearing being normally inclined to the axis of the grinding wheel, and means constructed and arranged to enable the standard to assume another position with, its bearing inclined at a reversed angle with relation to the grinding wheel.

4. In a grinding machine having a grinding wheel and connected knife and template carriers, a standard having an inclined bearing and being pivoted to the knife carrier whereby the inclination of the bearing may be changed with respect to the axis of the grinding wheel to provide for the grinding of cutter heads whose cutting blades are differently arranged.

5. In a grinding machine having a grinding wheel and connected knife and template carriers, a standard having a bearing inclined to the axis of the grinding wheel to receive the shaft of a rotary cutter, and a trunnion to secure the standard on the knife carrier so that it can be reversely inclined to receive a cutter head having its blades reversed.

6. In a grinding machine having a grinding wheel and connected knife and template carriers, a bearing inclined to the axis of the grinding wheel to receive a rotary cutter having cutting blades with a predetermined cutting angle, and means to reverse the inclination of the bearing to receive a rotary cutter having cutting blades with the cutting angle reversed.

7. In a grinding machine having a grinding wheel and connected knife and template carriers, a bearing inclined to the axis of the grinding wheel to receive a rotary cutter having cutting blades with a definite cutting angle, and a trunnion securing the bearing to the knife carrier whereby the inclination of the bearing may be reversed to receive a rotary cutter having cutting blades with the cutting angle reversed.

8. In a grinding machine having a grinding wheel and connected knife and template carriers, a bearing inclined to the axis of the grinding wheel to receive a rotary cutter having cutting blades with a definite cutting angle, a trunnion securing the bearing to the knife carrier whereby the inclination of the bearing may be reversed to receive a rotary cutter having cutting blades with the cutting angle reversed, and means to secure the bearing in either position.

9. In a grinding machine, a grinding wheel, a knife carrier, an apertured bracket extending therefrom, a standard trunnioned on the bracket and having an inclined bearing for the shaft of a rotary cutter, and means for securing the standard and bearing in different angular positions to hold the different cutters in grinding positions.

19. In a grinding machine, a grinding I Wheel, a bracket supported adjacent to the and engaging the standard to hold the standard and bearing in a plurality of positions on the bracket to provide for the 10 grinding of different cutter heads.

In testimony whereof I have signed my name to this specification.

RALPH F. KNIGHT. 

